At \(\mbox{\textit {Fr}}= 2\) , there are significant differences in \(U_d\)  evolution between the disk and spheroid wakes. In the \(\mbox{\textit {Fr}}=2\)  spheroid wake, \(U_d\)  shows an increased decay rate from the beginning. Although not shown here, the wake establishment is affected similarly to the \(\mbox{\textit {Fr}}=1\)  wake of the 4:1 spheroid of [1]}, where there was no 3D regime. The boundary layer evolution on the body and the separation are affected by stratification. At \(Nt\approx \pi \) , there is a sudden change in the decay rate due to the lee-wave-induced oscillatory modulation [2]} observed in the \(3 \lesssim x \lesssim 10\)  region. This oscillatory modulation gets weaker downstream as the lee-wave amplitude decreases with the distance from the source.
